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    <title>Document</title>
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    <script>
        var one=prompt('请输入你要的操作:\n'+'1.存钱\n'+'2.取钱\n'+'3.显示余额\n'+'4.退出')
        while (one=1) {
            var two1=prompt('请问你要取多少钱？')
               break
        }while (one=2) {
            var two=prompt('请问你要取多少钱？')
               break;
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